diff options
Diffstat (limited to 'drivers/net/ethernet/intel/i40evf/i40e_txrx.c')
-rw-r--r-- | drivers/net/ethernet/intel/i40evf/i40e_txrx.c | 360 |
1 files changed, 194 insertions, 166 deletions
diff --git a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c index fb6cd7e5d3be..6d66fcdc6122 100644 --- a/drivers/net/ethernet/intel/i40evf/i40e_txrx.c +++ b/drivers/net/ethernet/intel/i40evf/i40e_txrx.c @@ -861,16 +861,7 @@ static inline void i40e_rx_checksum(struct i40e_vsi *vsi, u16 rx_ptype) { struct i40e_rx_ptype_decoded decoded = decode_rx_desc_ptype(rx_ptype); - bool ipv4 = false, ipv6 = false; - bool ipv4_tunnel, ipv6_tunnel; - __wsum rx_udp_csum; - struct iphdr *iph; - __sum16 csum; - - ipv4_tunnel = (rx_ptype >= I40E_RX_PTYPE_GRENAT4_MAC_PAY3) && - (rx_ptype <= I40E_RX_PTYPE_GRENAT4_MACVLAN_IPV6_ICMP_PAY4); - ipv6_tunnel = (rx_ptype >= I40E_RX_PTYPE_GRENAT6_MAC_PAY3) && - (rx_ptype <= I40E_RX_PTYPE_GRENAT6_MACVLAN_IPV6_ICMP_PAY4); + bool ipv4, ipv6, ipv4_tunnel, ipv6_tunnel; skb->ip_summed = CHECKSUM_NONE; @@ -886,12 +877,10 @@ static inline void i40e_rx_checksum(struct i40e_vsi *vsi, if (!(decoded.known && decoded.outer_ip)) return; - if (decoded.outer_ip == I40E_RX_PTYPE_OUTER_IP && - decoded.outer_ip_ver == I40E_RX_PTYPE_OUTER_IPV4) - ipv4 = true; - else if (decoded.outer_ip == I40E_RX_PTYPE_OUTER_IP && - decoded.outer_ip_ver == I40E_RX_PTYPE_OUTER_IPV6) - ipv6 = true; + ipv4 = (decoded.outer_ip == I40E_RX_PTYPE_OUTER_IP) && + (decoded.outer_ip_ver == I40E_RX_PTYPE_OUTER_IPV4); + ipv6 = (decoded.outer_ip == I40E_RX_PTYPE_OUTER_IP) && + (decoded.outer_ip_ver == I40E_RX_PTYPE_OUTER_IPV6); if (ipv4 && (rx_error & (BIT(I40E_RX_DESC_ERROR_IPE_SHIFT) | @@ -915,36 +904,17 @@ static inline void i40e_rx_checksum(struct i40e_vsi *vsi, if (rx_error & BIT(I40E_RX_DESC_ERROR_PPRS_SHIFT)) return; - /* If VXLAN traffic has an outer UDPv4 checksum we need to check - * it in the driver, hardware does not do it for us. - * Since L3L4P bit was set we assume a valid IHL value (>=5) - * so the total length of IPv4 header is IHL*4 bytes - * The UDP_0 bit *may* bet set if the *inner* header is UDP + /* The hardware supported by this driver does not validate outer + * checksums for tunneled VXLAN or GENEVE frames. I don't agree + * with it but the specification states that you "MAY validate", it + * doesn't make it a hard requirement so if we have validated the + * inner checksum report CHECKSUM_UNNECESSARY. */ - if (ipv4_tunnel) { - skb->transport_header = skb->mac_header + - sizeof(struct ethhdr) + - (ip_hdr(skb)->ihl * 4); - - /* Add 4 bytes for VLAN tagged packets */ - skb->transport_header += (skb->protocol == htons(ETH_P_8021Q) || - skb->protocol == htons(ETH_P_8021AD)) - ? VLAN_HLEN : 0; - - if ((ip_hdr(skb)->protocol == IPPROTO_UDP) && - (udp_hdr(skb)->check != 0)) { - rx_udp_csum = udp_csum(skb); - iph = ip_hdr(skb); - csum = csum_tcpudp_magic(iph->saddr, iph->daddr, - (skb->len - - skb_transport_offset(skb)), - IPPROTO_UDP, rx_udp_csum); - - if (udp_hdr(skb)->check != csum) - goto checksum_fail; - - } /* else its GRE and so no outer UDP header */ - } + + ipv4_tunnel = (rx_ptype >= I40E_RX_PTYPE_GRENAT4_MAC_PAY3) && + (rx_ptype <= I40E_RX_PTYPE_GRENAT4_MACVLAN_IPV6_ICMP_PAY4); + ipv6_tunnel = (rx_ptype >= I40E_RX_PTYPE_GRENAT6_MAC_PAY3) && + (rx_ptype <= I40E_RX_PTYPE_GRENAT6_MACVLAN_IPV6_ICMP_PAY4); skb->ip_summed = CHECKSUM_UNNECESSARY; skb->csum_level = ipv4_tunnel || ipv6_tunnel; @@ -1554,11 +1524,18 @@ out: static int i40e_tso(struct i40e_ring *tx_ring, struct sk_buff *skb, u8 *hdr_len, u64 *cd_type_cmd_tso_mss) { - u32 cd_cmd, cd_tso_len, cd_mss; - struct ipv6hdr *ipv6h; - struct tcphdr *tcph; - struct iphdr *iph; - u32 l4len; + u64 cd_cmd, cd_tso_len, cd_mss; + union { + struct iphdr *v4; + struct ipv6hdr *v6; + unsigned char *hdr; + } ip; + union { + struct tcphdr *tcp; + struct udphdr *udp; + unsigned char *hdr; + } l4; + u32 paylen, l4_offset; int err; if (skb->ip_summed != CHECKSUM_PARTIAL) @@ -1571,35 +1548,60 @@ static int i40e_tso(struct i40e_ring *tx_ring, struct sk_buff *skb, if (err < 0) return err; - iph = skb->encapsulation ? inner_ip_hdr(skb) : ip_hdr(skb); - ipv6h = skb->encapsulation ? inner_ipv6_hdr(skb) : ipv6_hdr(skb); - - if (iph->version == 4) { - tcph = skb->encapsulation ? inner_tcp_hdr(skb) : tcp_hdr(skb); - iph->tot_len = 0; - iph->check = 0; - tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, - 0, IPPROTO_TCP, 0); - } else if (ipv6h->version == 6) { - tcph = skb->encapsulation ? inner_tcp_hdr(skb) : tcp_hdr(skb); - ipv6h->payload_len = 0; - tcph->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, - 0, IPPROTO_TCP, 0); + ip.hdr = skb_network_header(skb); + l4.hdr = skb_transport_header(skb); + + /* initialize outer IP header fields */ + if (ip.v4->version == 4) { + ip.v4->tot_len = 0; + ip.v4->check = 0; + } else { + ip.v6->payload_len = 0; + } + + if (skb_shinfo(skb)->gso_type & (SKB_GSO_UDP_TUNNEL | SKB_GSO_GRE | + SKB_GSO_UDP_TUNNEL_CSUM)) { + if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM) { + /* determine offset of outer transport header */ + l4_offset = l4.hdr - skb->data; + + /* remove payload length from outer checksum */ + paylen = (__force u16)l4.udp->check; + paylen += ntohs(1) * (u16)~(skb->len - l4_offset); + l4.udp->check = ~csum_fold((__force __wsum)paylen); + } + + /* reset pointers to inner headers */ + ip.hdr = skb_inner_network_header(skb); + l4.hdr = skb_inner_transport_header(skb); + + /* initialize inner IP header fields */ + if (ip.v4->version == 4) { + ip.v4->tot_len = 0; + ip.v4->check = 0; + } else { + ip.v6->payload_len = 0; + } } - l4len = skb->encapsulation ? inner_tcp_hdrlen(skb) : tcp_hdrlen(skb); - *hdr_len = (skb->encapsulation - ? (skb_inner_transport_header(skb) - skb->data) - : skb_transport_offset(skb)) + l4len; + /* determine offset of inner transport header */ + l4_offset = l4.hdr - skb->data; + + /* remove payload length from inner checksum */ + paylen = (__force u16)l4.tcp->check; + paylen += ntohs(1) * (u16)~(skb->len - l4_offset); + l4.tcp->check = ~csum_fold((__force __wsum)paylen); + + /* compute length of segmentation header */ + *hdr_len = (l4.tcp->doff * 4) + l4_offset; /* find the field values */ cd_cmd = I40E_TX_CTX_DESC_TSO; cd_tso_len = skb->len - *hdr_len; cd_mss = skb_shinfo(skb)->gso_size; - *cd_type_cmd_tso_mss |= ((u64)cd_cmd << I40E_TXD_CTX_QW1_CMD_SHIFT) | - ((u64)cd_tso_len << - I40E_TXD_CTX_QW1_TSO_LEN_SHIFT) | - ((u64)cd_mss << I40E_TXD_CTX_QW1_MSS_SHIFT); + *cd_type_cmd_tso_mss |= (cd_cmd << I40E_TXD_CTX_QW1_CMD_SHIFT) | + (cd_tso_len << I40E_TXD_CTX_QW1_TSO_LEN_SHIFT) | + (cd_mss << I40E_TXD_CTX_QW1_MSS_SHIFT); return 1; } @@ -1609,129 +1611,157 @@ static int i40e_tso(struct i40e_ring *tx_ring, struct sk_buff *skb, * @tx_flags: pointer to Tx flags currently set * @td_cmd: Tx descriptor command bits to set * @td_offset: Tx descriptor header offsets to set + * @tx_ring: Tx descriptor ring * @cd_tunneling: ptr to context desc bits **/ -static void i40e_tx_enable_csum(struct sk_buff *skb, u32 *tx_flags, - u32 *td_cmd, u32 *td_offset, - struct i40e_ring *tx_ring, - u32 *cd_tunneling) +static int i40e_tx_enable_csum(struct sk_buff *skb, u32 *tx_flags, + u32 *td_cmd, u32 *td_offset, + struct i40e_ring *tx_ring, + u32 *cd_tunneling) { - struct ipv6hdr *this_ipv6_hdr; - unsigned int this_tcp_hdrlen; - struct iphdr *this_ip_hdr; - u32 network_hdr_len; - u8 l4_hdr = 0; - struct udphdr *oudph; - struct iphdr *oiph; - u32 l4_tunnel = 0; + union { + struct iphdr *v4; + struct ipv6hdr *v6; + unsigned char *hdr; + } ip; + union { + struct tcphdr *tcp; + struct udphdr *udp; + unsigned char *hdr; + } l4; + unsigned char *exthdr; + u32 offset, cmd = 0, tunnel = 0; + __be16 frag_off; + u8 l4_proto = 0; + + if (skb->ip_summed != CHECKSUM_PARTIAL) + return 0; + + ip.hdr = skb_network_header(skb); + l4.hdr = skb_transport_header(skb); + + /* compute outer L2 header size */ + offset = ((ip.hdr - skb->data) / 2) << I40E_TX_DESC_LENGTH_MACLEN_SHIFT; if (skb->encapsulation) { - switch (ip_hdr(skb)->protocol) { + /* define outer network header type */ + if (*tx_flags & I40E_TX_FLAGS_IPV4) { + tunnel |= (*tx_flags & I40E_TX_FLAGS_TSO) ? + I40E_TX_CTX_EXT_IP_IPV4 : + I40E_TX_CTX_EXT_IP_IPV4_NO_CSUM; + + l4_proto = ip.v4->protocol; + } else if (*tx_flags & I40E_TX_FLAGS_IPV6) { + tunnel |= I40E_TX_CTX_EXT_IP_IPV6; + + exthdr = ip.hdr + sizeof(*ip.v6); + l4_proto = ip.v6->nexthdr; + if (l4.hdr != exthdr) + ipv6_skip_exthdr(skb, exthdr - skb->data, + &l4_proto, &frag_off); + } + + /* compute outer L3 header size */ + tunnel |= ((l4.hdr - ip.hdr) / 4) << + I40E_TXD_CTX_QW0_EXT_IPLEN_SHIFT; + + /* switch IP header pointer from outer to inner header */ + ip.hdr = skb_inner_network_header(skb); + + /* define outer transport */ + switch (l4_proto) { case IPPROTO_UDP: - oudph = udp_hdr(skb); - oiph = ip_hdr(skb); - l4_tunnel = I40E_TXD_CTX_UDP_TUNNELING; + tunnel |= I40E_TXD_CTX_UDP_TUNNELING; + *tx_flags |= I40E_TX_FLAGS_VXLAN_TUNNEL; + break; + case IPPROTO_GRE: + tunnel |= I40E_TXD_CTX_GRE_TUNNELING; *tx_flags |= I40E_TX_FLAGS_VXLAN_TUNNEL; break; default: - return; - } - network_hdr_len = skb_inner_network_header_len(skb); - this_ip_hdr = inner_ip_hdr(skb); - this_ipv6_hdr = inner_ipv6_hdr(skb); - this_tcp_hdrlen = inner_tcp_hdrlen(skb); - - if (*tx_flags & I40E_TX_FLAGS_IPV4) { - if (*tx_flags & I40E_TX_FLAGS_TSO) { - *cd_tunneling |= I40E_TX_CTX_EXT_IP_IPV4; - ip_hdr(skb)->check = 0; - } else { - *cd_tunneling |= - I40E_TX_CTX_EXT_IP_IPV4_NO_CSUM; - } - } else if (*tx_flags & I40E_TX_FLAGS_IPV6) { - *cd_tunneling |= I40E_TX_CTX_EXT_IP_IPV6; if (*tx_flags & I40E_TX_FLAGS_TSO) - ip_hdr(skb)->check = 0; - } + return -1; - /* Now set the ctx descriptor fields */ - *cd_tunneling |= (skb_network_header_len(skb) >> 2) << - I40E_TXD_CTX_QW0_EXT_IPLEN_SHIFT | - l4_tunnel | - ((skb_inner_network_offset(skb) - - skb_transport_offset(skb)) >> 1) << - I40E_TXD_CTX_QW0_NATLEN_SHIFT; - if (this_ip_hdr->version == 6) { - *tx_flags &= ~I40E_TX_FLAGS_IPV4; - *tx_flags |= I40E_TX_FLAGS_IPV6; + skb_checksum_help(skb); + return 0; } - if ((tx_ring->flags & I40E_TXR_FLAGS_OUTER_UDP_CSUM) && - (l4_tunnel == I40E_TXD_CTX_UDP_TUNNELING) && - (*cd_tunneling & I40E_TXD_CTX_QW0_EXT_IP_MASK)) { - oudph->check = ~csum_tcpudp_magic(oiph->saddr, - oiph->daddr, - (skb->len - skb_transport_offset(skb)), - IPPROTO_UDP, 0); - *cd_tunneling |= I40E_TXD_CTX_QW0_L4T_CS_MASK; - } - } else { - network_hdr_len = skb_network_header_len(skb); - this_ip_hdr = ip_hdr(skb); - this_ipv6_hdr = ipv6_hdr(skb); - this_tcp_hdrlen = tcp_hdrlen(skb); + /* compute tunnel header size */ + tunnel |= ((ip.hdr - l4.hdr) / 2) << + I40E_TXD_CTX_QW0_NATLEN_SHIFT; + + /* indicate if we need to offload outer UDP header */ + if ((*tx_flags & I40E_TX_FLAGS_TSO) && + (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM)) + tunnel |= I40E_TXD_CTX_QW0_L4T_CS_MASK; + + /* record tunnel offload values */ + *cd_tunneling |= tunnel; + + /* switch L4 header pointer from outer to inner */ + l4.hdr = skb_inner_transport_header(skb); + l4_proto = 0; + + /* reset type as we transition from outer to inner headers */ + *tx_flags &= ~(I40E_TX_FLAGS_IPV4 | I40E_TX_FLAGS_IPV6); + if (ip.v4->version == 4) + *tx_flags |= I40E_TX_FLAGS_IPV4; + if (ip.v6->version == 6) + *tx_flags |= I40E_TX_FLAGS_IPV6; } /* Enable IP checksum offloads */ if (*tx_flags & I40E_TX_FLAGS_IPV4) { - l4_hdr = this_ip_hdr->protocol; + l4_proto = ip.v4->protocol; /* the stack computes the IP header already, the only time we * need the hardware to recompute it is in the case of TSO. */ - if (*tx_flags & I40E_TX_FLAGS_TSO) { - *td_cmd |= I40E_TX_DESC_CMD_IIPT_IPV4_CSUM; - this_ip_hdr->check = 0; - } else { - *td_cmd |= I40E_TX_DESC_CMD_IIPT_IPV4; - } - /* Now set the td_offset for IP header length */ - *td_offset = (network_hdr_len >> 2) << - I40E_TX_DESC_LENGTH_IPLEN_SHIFT; + cmd |= (*tx_flags & I40E_TX_FLAGS_TSO) ? + I40E_TX_DESC_CMD_IIPT_IPV4_CSUM : + I40E_TX_DESC_CMD_IIPT_IPV4; } else if (*tx_flags & I40E_TX_FLAGS_IPV6) { - l4_hdr = this_ipv6_hdr->nexthdr; - *td_cmd |= I40E_TX_DESC_CMD_IIPT_IPV6; - /* Now set the td_offset for IP header length */ - *td_offset = (network_hdr_len >> 2) << - I40E_TX_DESC_LENGTH_IPLEN_SHIFT; + cmd |= I40E_TX_DESC_CMD_IIPT_IPV6; + + exthdr = ip.hdr + sizeof(*ip.v6); + l4_proto = ip.v6->nexthdr; + if (l4.hdr != exthdr) + ipv6_skip_exthdr(skb, exthdr - skb->data, + &l4_proto, &frag_off); } - /* words in MACLEN + dwords in IPLEN + dwords in L4Len */ - *td_offset |= (skb_network_offset(skb) >> 1) << - I40E_TX_DESC_LENGTH_MACLEN_SHIFT; + + /* compute inner L3 header size */ + offset |= ((l4.hdr - ip.hdr) / 4) << I40E_TX_DESC_LENGTH_IPLEN_SHIFT; /* Enable L4 checksum offloads */ - switch (l4_hdr) { + switch (l4_proto) { case IPPROTO_TCP: /* enable checksum offloads */ - *td_cmd |= I40E_TX_DESC_CMD_L4T_EOFT_TCP; - *td_offset |= (this_tcp_hdrlen >> 2) << - I40E_TX_DESC_LENGTH_L4_FC_LEN_SHIFT; + cmd |= I40E_TX_DESC_CMD_L4T_EOFT_TCP; + offset |= l4.tcp->doff << I40E_TX_DESC_LENGTH_L4_FC_LEN_SHIFT; break; case IPPROTO_SCTP: /* enable SCTP checksum offload */ - *td_cmd |= I40E_TX_DESC_CMD_L4T_EOFT_SCTP; - *td_offset |= (sizeof(struct sctphdr) >> 2) << - I40E_TX_DESC_LENGTH_L4_FC_LEN_SHIFT; + cmd |= I40E_TX_DESC_CMD_L4T_EOFT_SCTP; + offset |= (sizeof(struct sctphdr) >> 2) << + I40E_TX_DESC_LENGTH_L4_FC_LEN_SHIFT; break; case IPPROTO_UDP: /* enable UDP checksum offload */ - *td_cmd |= I40E_TX_DESC_CMD_L4T_EOFT_UDP; - *td_offset |= (sizeof(struct udphdr) >> 2) << - I40E_TX_DESC_LENGTH_L4_FC_LEN_SHIFT; + cmd |= I40E_TX_DESC_CMD_L4T_EOFT_UDP; + offset |= (sizeof(struct udphdr) >> 2) << + I40E_TX_DESC_LENGTH_L4_FC_LEN_SHIFT; break; default: - break; + if (*tx_flags & I40E_TX_FLAGS_TSO) + return -1; + skb_checksum_help(skb); + return 0; } + + *td_cmd |= cmd; + *td_offset |= offset; + + return 1; } /** @@ -2147,12 +2177,10 @@ static netdev_tx_t i40e_xmit_frame_ring(struct sk_buff *skb, td_cmd |= I40E_TX_DESC_CMD_ICRC; /* Always offload the checksum, since it's in the data descriptor */ - if (skb->ip_summed == CHECKSUM_PARTIAL) { - tx_flags |= I40E_TX_FLAGS_CSUM; - - i40e_tx_enable_csum(skb, &tx_flags, &td_cmd, &td_offset, - tx_ring, &cd_tunneling); - } + tso = i40e_tx_enable_csum(skb, &tx_flags, &td_cmd, &td_offset, + tx_ring, &cd_tunneling); + if (tso < 0) + goto out_drop; i40e_create_tx_ctx(tx_ring, cd_type_cmd_tso_mss, cd_tunneling, cd_l2tag2); |